A superb large electric green crystal from the type locality and type find of January 1993. Highly lustrous and finely layered. A choice thumbnail picked by Carl Davis, one of the most consummately choosy collectors of thumbnails I have had the privilege to know, and my own personal mentor in both getting me into this hobby and teaching ma about rarities. When I was a kid, he used to go to Tucson every year with the goal of bringing home one superlative thumbnail, preferably a world-class rarity that was affordable because others didn't recognize its true worth as easily as with common species. This was his trophy to bring home in 1993. (TYPE and ONLY LOCALITY)